Comparative analysis of photosynthetic properties in ice algae and phytoplankton inhabiting Franklin Bay, the Canadian Arctic, with those in mesophilic diatoms during CASES 03-04

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概要

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• Psychrophilic phytoplankton and ice algae were collected in Franklin Bay, the Canadian Arctic, in late May 2004, and the photosynthetic properties were measured at 4°C using a pulse amplitude modulation fluorometer (Phyto-PAM). Rapid light curve measurements allowed for the assessment of the photosynthetic efficiency (α), maximal electron transport rate (rETRmax), and minimum saturating irradiance (Ek) in the samples. The values of α in phytoplankton (0.63-0.68) were much larger than those in ice algae (0.10-0.51), and the values of rETRmax in phytoplankton (4.6-6.7) were relatively larger than those in ice algae (1.8-4.3). However, Ek showed similar values in both samples and were around 10μmol photonsm^<-2>・s^<-1>. These values were systematically compared with those obtained from mesophilic marine diatoms (a centric diatom, Chaetoceros gracilis, and a pennate diatom, Phaeodactylum tricornutum) grown under various irradiances in the laboratory. The highly shade-adapted features of ice algae and phytoplankton were disclosed through this comparative analysis. It was also found that the non-photochemical quenching was much higher in psychrophilic samples than in mesophilic diatoms grown under moderate irradiance. Furthermore, in ice algae and phytoplankton, the decrease in rETR at high irradiances was prominent, showing that they were highly susceptible to photoinhibition. Our comparative analysis using psychrophilic phytoplankton, ice algae and two strains of mesophilic diatoms also revealed that the dependency on the xanthophyll cycle for the protection mechanisms of photosystems were remarkably different between the groups, indicating that the acclimation strategies to growth irradiances were variable between species. Such variable acclimation strategies could be one of the forces that results in a diverse algal flora that enables this region around Franklin Bay to be a productive area, even though the psychrophilic phytoplankton and ice algae are highly shade-adapted.

• 国立極地研究所の論文

著者

• Aikawa Shimpei

  Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja

• Hattori Hiroshi

  Department of Biological Science and Engineering, Tokai University, Minami-sawa, Minami-ku, Sapporo

• Kudoh Sakae

  National Institute of Polar Research, Kaga 1-chome, Itabashi-ku, Tokyo 173-8515, Japan

• Kashino Yasuhiro

  Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja

• Satoh Kazuhiko

  Department of Life Science, University of Hyogo, 3-2-1 Kohto, Kamigohri, Ako-gun, Hyogo 678-1297, Ja

• Fukuchi Mitsuo

  National Institute of Polar Research, 10-3 Midori-cho, Tachikawa-shi, Tokyo 190-8518, Japan

• Sampei Makoto

  National Institute Of Polar Research

• Ban Akiko

  Department of Life Science, Graduate School of Life Science,University of Hyogo

• Sasaki Hiroshi

  Department of Biological Technology, Faculty of Science and Engineering,Senshu University of Ishinom

• Kudoh Sakae

  National Institute Of Polar Research Kaga 1-chome Itabashi-ku Tokyo 173-8515 Japan

• Kudoh Sakae

  National Institute Of Polar Research

• Kashino Yasuhiro

  Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan

• Kashino Yasuhiro

  Dept. Life Sci. Fac. Sci. Himeji Inst. Tech. Harima Science Garden City

• Ban Akiko

  Department Of Life Science Graduate School Of Life Science University Of Hyogo

• Satoh Kazuhiko

  Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan

• Satoh K

  Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan

• Satoh Kazuhiko

  Department Of Biology Faculty Of Science Toho University

• Fukuchi M

  National Institute Of Polar Research

• Kashino Yasuhiro

  Department Of Botany Faculty Of Science University Of Tokyo:(present)department Of Biological Scienc

• Sasaki Horoshi

  Faculty of Agriculture, Tohoku University

• Fukuchi M

  National Institute Of Polar Research 10-3 Midori-cho Tachikawa-shi Tokyo 190-8518 Japan

• Fukuchi M

  National Inst. Polar Res. Tokyo

• Fukuchi Mitsuo

  National Inst. Of Polar Res. Kaga Tokyo 173-8515 Jpn

• Hattori H

  Department Of Marine Sciences And Technology School Of Engineering Hokkaido Tokai University

• Aikawa Shimpei

  Department Of Life Science University Of Hyogo 3-2-1 Kohto Kamigohri Ako-gun Hyogo 678-1297 Japan

• Satoh Hiroo

  Department Of Biological Technology Faculty Of Science And Engineering Senshu University Of Ishinoma

• Satoh Hiroo

  Department Of Biological Technology Faculty Of Science And Engineering Senshu University Of Ishinoma

• Hattori Hiroshi

  Department Of Biological Science And Engineering Tokai University Minami-sawa Minami-ku Sapporo 005-

• Fukuchi Mitsuo

  National Inst. Of Polar Res. 10-3 Midori-cho Tachikawa Tokyo 190-8518 Jpn

• Sasaki Hiroshi

  Department Of Agricultural Chemistry Faculty Of Agriculture Hokkaido University

• Kudoh Sakae

  National Inst. Of Polar Res. 10-3 Midoricho Tachikawa Tokyo 190-8518 Jpn

• Sasaki Hiroshi

  金沢大学 自然科学研究科臨床薬学

• Sasaki Hiroshi

  Faculty Of Agriculture Tolioku University:(present Address)department Of Biotechnology Senshu University Of Ishinomaki

• AIKAWA Shimpei

  Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University

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